don't delete the exiting tooltip if SetToolTip() is called with the same one

[wxWidgets.git] / src / common / wxchar.cpp

diff --git a/src/common/wxchar.cpp b/src/common/wxchar.cpp
index b3f6003eeac0935d2ceb817bcf47b7a07f17a029..0f8e76ccbb2cd07dd7ff014d82af64f69f2dc7db 100644 (file)
--- a/src/common/wxchar.cpp
+++ b/src/common/wxchar.cpp
@@ -17,7 +17,7 @@
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
-  #pragma hdrstop
+    #pragma hdrstop
 #endif
 
 #define _ISOC9X_SOURCE 1 // to get vsscanf()
@@ -28,24 +28,23 @@
 #include <string.h>
 
 #ifndef __WXWINCE__
-#include <time.h>
-#include <locale.h>
+    #include <time.h>
+    #include <locale.h>
 #else
-#include "wx/msw/wince/time.h"
+    #include "wx/msw/wince/time.h"
 #endif
 
 #ifndef WX_PRECOMP
-  #include "wx/defs.h"
-  #include "wx/wxchar.h"
-  #include "wx/string.h"
-  #include "wx/hash.h"
+    #include "wx/wxchar.h"
+    #include "wx/string.h"
+    #include "wx/hash.h"
 #endif
 
 #if defined(__WIN32__) && defined(wxNEED_WX_CTYPE_H)
   #include <windef.h>
-  #include <winbase.h>
-  #include <winnls.h>
-  #include <winnt.h>
+    #include <winbase.h>
+    #include <winnls.h>
+    #include <winnt.h>
 #endif
 
 #if defined(__MWERKS__) && __MSL__ >= 0x6000
@@ -78,6 +77,12 @@ size_t WXDLLEXPORT wxMB2WC(wchar_t *buf, const char *psz, size_t n)
 #endif
   }
 
+  // note that we rely on common (and required by Unix98 but unfortunately not
+  // C99) extension which allows to call mbs(r)towcs() with NULL output pointer
+  // to just get the size of the needed buffer -- this is needed as otherwise
+  // we have no idea about how much space we need and if the CRT doesn't
+  // support it (the only currently known example being Metrowerks, see
+  // wx/wxchar.h) we don't use its mbstowcs() at all
 #ifdef HAVE_WCSRTOMBS
   return mbsrtowcs((wchar_t *) NULL, &psz, 0, &mbstate);
 #else